Tag Archives: UHF

IC-7100 now on VHF/UHF

It took long enough but I finally setup the IC-7100 for VHF/UHF use. The rig was programmed with the local repeater frequencies using RT-Systems programming software and a download from Repeater Book. Pretty straightforward overall. I should be able to use the IC-7100 on digital VHF nets run hear locally. There is a 6:30 net on Wednesdays through the repeater and a Simplex net on Thursdays at 7pm. I will still share the discone between this rig and the Yaesu FT-2900R.

One thing I noticed thus far is that he IC-7100 is hitting the repeaters in Harlingen and in South Padre Island. Not sure why this is but glad it seems to work.

Next up I’ll try and configure DStar.

More Thoughts on The Flea Market HDTV Antenna

I dug around in a junk box and found a TV transformer and a length of 300 Ohm twin lead. Looking at the frequencies of the local TV channels, they are spread between 506 and 674 MHz UHF. Channel 5 is on 210Mhz VHF. I am thinking of cutting a 1/2 wavelength of the twin lead cut for 580MHz and making a folded dipole out of it. I’ll place the transformer right at the feedpoint. It strikes me that this would work better than the dipole I sourced from the flea market. I’ll build one of these and do an A vs. B test over the next few days.

I may also try a coaxial dipole made from RG-59 or RG-6 coax just for grins as well. That could end up being and even cheaper version that is at least tuned to the TV frequencies.

I figure the cost of making one of the dipoles is around $5 with the transformer being the bulk of the cost. The coaxial dipole would eliminate the need for a transformer. 300 Ohm twin lead for TV is getting hard to find but I am expecting decent performance.

The loop antenna makes some sense as being better than the dipole. It has some directivity, gain and it is better matched to the TV transformer.The crossed loops that are at the flea market would make sense in that they provide a more omnidirectional pattern (assuming that they are properly constructed).

TYT MD-380 DMR Radio Arrives!

My TYT MD-380 arrived yesterday for DMR use. First impression is positive as looks like a solidly build radio and comes complete with charger, two UHF antennas and a USB programming cable. I downloaded the TYT software and drivers from their website and these installed without issue. I did not have the Talkgroup info available oto program this myself, but Joe, N5JLR, met with me this morning and downloaded the code block needed to setup the radio for use on the local repeater.

Amazingly crisp audio during a QSO is the result! I am looking forward to playing with this and many thanks to Joe and the local digital club for getting DMR on the air for this area.

DMR HT Radio on the Way

I ordered a TYT MD-380 DMR radio today on Amazon. It should arrive by end of next week. In preparation to setting this up, I have registered my call-sign. The local digital group has setup a local repeater that is linked to one in the upper valley as well. Should be fun to play with digital voice on UHF.

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